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Stockholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2009 | Jun. 30, 2013 William Blair & Company, L.L.C [Member] | Sep. 30, 2013 William Blair & Company, L.L.C [Member] | Jun. 30, 2013 William Blair & Company, L.L.C [Member] | Sep. 30, 2014 Warrants [Member] | Dec. 31, 2009 Warrants [Member] | Sep. 30, 2014 Convertible debentures [Member] Warrants [Member] | Sep. 30, 2014 2012 Plan [Member] | Feb. 19, 2014 Minimum [Member] | Feb. 19, 2014 Maximum [Member] | Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2013 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2012 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2011 Restricted Stock Units (RSUs) [Member] | Sep. 30, 2014 Restricted Stock Units (RSUs) [Member] 2012 Plan [Member] | Sep. 30, 2014 Restricted stock units [Member] | Sep. 30, 2013 Restricted stock units [Member] | Sep. 30, 2012 Restricted stock units [Member] | Sep. 30, 2014 Outstanding Restricted Stock [Member] | Sep. 30, 2014 Stock options [Member] | Sep. 30, 2013 Stock options [Member] | Sep. 30, 2012 Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares sold | 30,521,080 | 30,361,442 |  |  |  |  |  | 2,857,142 |  | 337,501 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, price per share |  |  |  |  |  |  |  | $ 5.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  | $ 16,004,797 |  |  |  | $ 13,877,447 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting discounts and commissions and other offering expenses |  |  |  |  |  |  |  | 1,122,549 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional shares of common stock to cover over allotments |  |  |  |  |  | 428,571 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriter option exercised |  |  |  |  |  |  | 2,127,350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other offering expenses | 0 | 1,245,196 | 0 |  |  |  | 122,647 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding | 30,521,080 | 30,361,442 |  |  |  |  |  |  | 6,667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued exercise price |  |  |  |  | $ 0.91 |  |  |  | $ 0.91 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expire date |  |  |  |  |  |  |  |  | 2014-12 |  | 2014-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock exercised |  |  |  |  |  |  |  |  |  |  | 330,834 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated average forfeiture rate | 13.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits received related to stock option exercises | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense | 3,444,480 | 2,791,862 | 2,599,858 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,151,689 | 2,023,023 | 2,070,786
Unrecognized compensation expense | 1,659,197 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,219,521 |  |  |  |  |  |
Weighted average period for unrecognized compensation expense expected to be recognized | 1 year 6 months 29 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 11 months 5 days |  |  |
Total intrinsic value of options exercised | 472,327 | 3,832,374 | 14,215,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price, outstanding shares | $ 4.11 | $ 4.09 | $ 3.39 | $ 1.34 |  |  |  |  |  |  |  |  |  |  | $ 4.71 | $ 4.85 | $ 6.30 | $ 5.12 |  |  |  |  |  |  |  |
Number of options granted to employees | 0 | 651,563 | 1,095,750 |  |  |  |  |  |  |  |  |  |  |  | 625,139 | 255,000 | 255,835 |  |  |  |  |  |  |  |  |
Common stock reserved for issuance under stock holders incentive plan |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock |  |  |  |  |  |  |  |  |  |  |  | 843,743 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding | 2,334,326 | 2,824,964 | 3,512,286 | 4,553,904 |  |  |  |  |  |  |  |  |  |  | 1,101,303 | 692,504 | 515,834 | 300,000 | 536,303 |  |  |  |  |  |  |
Number of common stock reserved for future grants |  |  |  |  |  |  |  |  |  |  |  | 2,776,678 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance of restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Restricted stock units vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |
Recognized stock-based compensation expense related to the outstanding RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,292,791 | $ 768,839 | $ 529,072 |  |  |  |

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